Oslo , Norway -LRB- CNN -RRB- -- The numbers tell a small part of the story : Eight dead in a bomb blast .

The names that police have released so far reveal a little more . Anne Lise Holter , 51 . Tove Ashill Knutsen , 56 . Hanna M. Orvik Endresen , 61 . Kai Hauge , 32 .

But a 16-minute video shot in the immediate aftermath of the explosion in Oslo , Norway , brings home the horror of what happened there on July 22 in a completely different way .

It 's not so much the sight of papers fluttering out of the shattered windows of office buildings , or even the red cables sticking out of the ripped concrete pavement .

It 's the sounds .

The whimpering of a woman near tears moments after the bomb blast . The constant crunch of broken glass underfoot . The urgency in the voices of passersby trying to help the wounded .

The insistent alarm bell ringing a three-second warning , pausing as if for breath , and ringing again . And again . And again . And again . And again .

And finally , the siren of a single ambulance , long after the explosion that smashed Norway 's calm .

The video was shot by Johan Christian Tandberg , who was driving through a tunnel under the government building that was the target of the attack when the bomb went off .

Authorities have charged Anders Behring Breivik , an apparent right-wing extremist with a hatred of Muslims and multi-culturalism , with setting off the bomb . He 's also charged in the shooting deaths of 68 people at a Labour Party youth camp on Utoya island , where he eventually surrendered to police . His lawyer says he admits carrying out the attacks .

People all over Norway sat in front of their televisions and cried when they heard the next day how many people had died , and they are still crying , Tandberg told CNN Thursday .

What he saw when he came out of the tunnel last week `` looked like a war zone , '' he said , adding that he immediately thought of the September 11 , 2001 , terror attacks in the United States .

He grabbed a camera and started filming on the spot . The resulting video shows central Oslo littered with street signs ripped out of the ground by the blast , insulation torn from buildings , and people wandering in shock .

He follows a man though a damaged building , looking for wounded people but finding only offices in complete disarray , furniture tossed around and ceiling panels hanging down .

Back on the streets , at least one person is seen with a cut on his leg , and several people cluster around another casualty . All the faces in the video are blurred .

An emergency services worker makes an urgent-sounding call into a radio . Smoke rises over a building in the near distance . Tree branches litter the ground . A woman weeps .

And the alarm bell rings . And rings . And rings .

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Johan Christian Tandberg was at the scene when a bomb went off

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He grabbed a camera and started filming

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Tandberg says the 9/11 attacks were the first thing he thought of

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The sounds of alarm bells and broken glass crunching underfoot punctuate the video

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Apparent right-wing extremist Anders Breivik is charged with the bombing and mass shooting that killed 76